class Person{
    constructor(){
    this.name = null;
    }
    getName (){
        console.log(this.name);
    }
}
const xc = new Person();
xc.name = 'xiongjbchen';
xc.getName()//this?
const ysg = new Person();
ysg.name = 'zwb';
ysg.getName();
const getName=xc.getName.bind(ysg);
getName();
xc.getName.call(ysg);
